Android Oreo based OFFICIAL LineageOS 15.1 for Mi Mix (lithium) is now available to download on the OFFICIAL LineageOS website. This is a step by step guide that explains how to install Official Lineage OS 15.1 on Mi Mix.

Starting from Lineage OS 15.1, LineageOS team has made stringent device support norms, which ensures that almost every important piece of hardware present on a phone MUST be in a working state on an OFFICIAL LineageOS 15.1 build. Which clearly means that users will enjoy a stock like upgrade experience on OFFICIAL Lineage OS 15.1 updates.

DONATION TO PROJECT/DEVELOPER(s):

If you like this ROM then do consider for a small contribution to balika011, blunden and LineageOS project: – Donate to LineageOS project – No donation link found for balika011, blunden

DISCLAIMER:THIS IS AN INITIAL OFFICIAL LINEAGE OS 15.1 BUILD WHICH MAY HAVE MINOR BUGS. HAVE A BACKUP BEFORE FLASHING THIS AND TRY AT YOUR OWN RISK. Installing a custom ROM may require an unlocked bootloader on Mi Mix, which may VOID your warranty and may delete all your data. Before proceeding further you may consider backup all data on the phone. You are the only person making changes to your phone and I cannot be held responsible for the mistakes done by you.

Root binary is NOT inbuilt in the OFFICIAL Lineage OS 15.1 ROM, so you need a separate SuperSu package or LineageOS su binary to install to gain ROOT access on the OFFICIAL LineageOS 15.1 ROM build. Here is Lineage OS 15.1 Rooting guide

If there is no in-built ROOT or it does not work for some reason then you can try SuperSU rooting guide to enable ROOT access.

HOW TO UPDATE/INSTALL OFFICIAL Lineage OS 15.1 for Mi Mix:

Follow this if you are flashing Lineage OS 15.1 for Mi Mix for the first time, or coming from UNOFFICIAL Lineage OS 15.1 ROM or any other custom ROM of any Android version:

NOTE:If you are on an OFFICIAL LineageOS 14.1 ROM then follow the LineageOS 15.1 Upgrade guide in the next section to upgrade to the OFFICIAL LineageOS 15.1.

Points to NOTE: – Try to avoid restoring apps backup using Titanium Backup. It may break things up. – Don’t restore system data using Titanium Backup! It will definitely break the current installation. – It is also discouraged to Restoring Apps + Data using Titanium Backup.

Boot into Recovery.

Make sure to have a Custom recovery like CWM or TWRP or any other custom recovery on your phone. If you don’t have then download the recovery for Mi Mix from above link and follow the Custom Recovery Installation Guide (it’s a generic guide which will work for TWRP as well as CWM recovery or any other recovery) provided it is in .img file extension.

Wipe data or do a factory reset, wipe Cache partition, wipe Dalvik Cache/ART cache and Format the System partition. – Here is a guide explaining how to wipe data using TWRP recovery.

Reboot and Enjoy Android Oreo on the OFFICIAL LineageOS 15.1 for Mi Mix.

Upgrading from earlier version of OFFICIAL LineageOS 14.1 or Lineage OS 15.1 for Mi Mix (lithium):

If you are on an OFFICIAL LineageOS 14.1 (yes, I mean the Android Nougat based OFFICIAL LineageOS 14.1) then you don’t need to wipe the data and you can upgrade to the OFFICIAL LineageOS 15.1 just by cleaning the system partition.

NOTE: – If you are on an OFFICIAL LineageOS 14.1 then you will be allowed to download the latest OFFICIAL LineageOS 15.1 using the updater app but you won’t be allowed to upgrade to LineageOS 15.1 on top of LineageOS 14.1 – So, you need to export the downloaded Lineage OS 15.1 ROM build file to the SD card or phone memory from the updater app: You can export the downloaded package to the sdcard/phone memory from the Updater app by long-pressing the downloaded file and then selecting “Export” on the top menu

Boot into Recovery.

– Make sure you have a latest custom Recovery that should be able to flash the LineageOS 15.1 ROM update.

Well, I installed this last week and I’m pretty happy with it (June 18, 2018 Build). Is stable, does not run the battery down and responsive. The huge advantage for me is getting Smart Lock to work since this is disabled in MIUI.

If I had to find something to complain about it would be that in low light conditions when the display is set to Auto it seems to jump back and forth quite often between making the screen brighter and darker which didn’t happen when on MIUI. I also could not find Single Hand Mode which on a phone this large is useful sometimes.